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渐晕效应
相关语句
  相似匹配句对
     Gravitational Lens Effect
     引力透镜效应
短句来源
     ‘DaVinci Effect’ in the Electronics Industry
     “达芬奇”效应
短句来源
     Research on vignetting in thermal imaging system
     红外系统中渐晕的研究
短句来源
     A Fast Method for Calculating Vignetted Pupil of Optical Systems
     光学系统渐晕光瞳的快速算法
短句来源
     Controling Vignatting Effect on the Aperture stop
     利用光栏面控制象差渐晕的计算
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  vignetting
It is noted that quantum-interference transconductance oscillations can occur only if the amplitude and phase of each of the three electron waves on the gate aperture, as well as electron-wave vignetting, are dependent on the gate potential.
      
A discussion is given of the possible techniques for cascade correction in beam-foil lifetime measurements, and of the inclusion of a window function to represent the vignetting effect close to the foil.
      
Details of dye choice, corrections for attenuation due to dye, particles and water, photobleaching, vignetting, CCD calibration, and illumination power and geometry corrections are presented.
      
The results were encouraging, given the degraded quality of the photograph and the fact that features were not centered, as well as the lack of information on lens vignetting characteristics to make corrections.
      
The 13 scanned films have been aligned, coadded, corrected for vignetting effects and cleaned of stellar features.
      
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  vignetting effect
A discussion is given of the possible techniques for cascade correction in beam-foil lifetime measurements, and of the inclusion of a window function to represent the vignetting effect close to the foil.
      
Figure 5 shows the recovery of fluxes for the input sources after correction for the vignetting effect.
      
We include the PSF model and background but do not apply the vignetting effect.
      


Fish-eye lenses or extreme wide-angle objectives have notable stop spherical aberration and stop coma. In order to calculate simply and easily the stop spherical aberration we adopt the series approximation and differentiation. So the entrance pupils can be defined accurately For the sake of improving the illuminance distribution on image plane, we apply induced iterative method to increase the stop coma that causes a great aberration vignetting effects. The effects make off-axis object points imaged by more...

Fish-eye lenses or extreme wide-angle objectives have notable stop spherical aberration and stop coma. In order to calculate simply and easily the stop spherical aberration we adopt the series approximation and differentiation. So the entrance pupils can be defined accurately For the sake of improving the illuminance distribution on image plane, we apply induced iterative method to increase the stop coma that causes a great aberration vignetting effects. The effects make off-axis object points imaged by more rays than axial object point. So the image plane has more uniform illuminance. At the same time, we intentionlly introduce a great quantity of barrel distortion into fish-eye lenses and extreme wide-angle objectives. This improves also the illuminance on the image plane effectively.

鱼眼透镜和超广角镜头具有很严重的光阑球差、光阑彗差。本文主题是:如何简捷计算其光阑球差以准确描述轴外物点成像光束的位置和结构以及如何利用光同阑彗差造成有效的像差渐晕以改善像面照度分布;文章提出用截断级数和微分方法解算光阑球差近似值,用诱导迭代方法人为扩大光阑彗差以增强像差渐晕效应,并达到了预期目的。

 
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